EP 0686881 A1 19951213 - Particulate polymer, electrophotographic toner, and preparation method
Title (en)
Particulate polymer, electrophotographic toner, and preparation method
Title (de)
Teilchenförmiges Polymer, elektrophotographischer Toner und Herstellungsmethode
Title (fr)
Polymère en particules, "toner" électrophotographique et méthode de préparation
Publication
Application
Priority
US 25552294 A 19940608
Abstract (en)
A method for making a polymeric particulate, polymeric electrophotographic toner and the particulate and toner. In the method a reaction mixture is prepared that includes vinyl type monomer, crosslinker, and chain transfer agent. The crosslinker has a concentration greater than 0.4 parts by weight per 100 parts by weight of the monomer. The crosslinker and the chain transfer agent together have a combined concentration of greater than 0.6 parts by weight per hundred parts of the monomer. The reaction mixture is subjected to addition polymerization conditions favoring formation of polymer including a first portion having a molecular weight in excess of 1 x 10<6> and a second, tetrahydrofuran soluble portion having a molecular weight distribution determined by molecular exclusion chromatography including a first peak centered in the molecular weight range of from 0.8 x 10<4> to 1 x 10<5>. The polymer is melt processed resulting in a melt product, which is then pulverizing to a volume average particle size of from 5 to 20 micrometers to produce particulate. The particulate includes polymer having a molecular weight distribution determined by molecular exclusion chromatography substantially retaining the first peak and including a second peak in the molecular weight range of from 1 x 10<5> to 1 x 10<7>. <IMAGE>
IPC 1-7
IPC 8 full level
C08J 3/12 (2006.01); C08F 2/00 (2006.01); C08F 2/22 (2006.01); G03G 9/087 (2006.01)
CPC (source: EP)
C08F 2/22 (2013.01); G03G 9/08708 (2013.01); G03G 9/08711 (2013.01); G03G 9/08791 (2013.01); G03G 9/08793 (2013.01)
Citation (search report)
- [X] EP 0575891 A2 19931229 - CANON KK [JP]
- [A] DE 3806595 A1 19880915 - KONISHIROKU PHOTO IND [JP]
- [A] PATENT ABSTRACTS OF JAPAN vol. 7, no. 164 (P - 211)<1309> 19 July 1983 (1983-07-19)
- [A] DATABASE "CHEMICAL ABSTRACTS" (HOST: STN): abs. 115: 184 182, Colombus, OH, USA; & JP-A-03 140 311 (NIPPON OIL & FATS K.K.) 14 June 1991
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 95108782 A 19950607; JP 14082895 A 19950607